TW200404467A - Method for enhanced mobile assisted positioning - Google Patents

Abstract

At a first user equipment (UE), an uplink signal is received of at least one second UE is received and time marked. At the first UE, a downlink signal from at least one base station is received and time marked. Observed time differences of arrival are determined using the time markings. A position of the first UE is determined based on the determined time differences of arrival.

Description

200404467 V. Description of the Invention (1) Field of the Invention The present invention relates to a wireless communication system. In particular, in the present invention, μ, X is related to the modification of the mobile user positioning method system assisted by user equipment. fThis background The enhanced capability of user equipment (U E) positioning is widely regarded as the difference and value-added features of 3 Q mobile communication networks, such as UMTS W-CDMA FDD or TDD or CDMA2000. A simple but effective user equipment (UE) positioning method used in 2G mobile communication systems is known as the "cell-id method", where the location of a UE is known to be at a cell level. This network knows the UE, because it has a base station with a radio frequency link and can therefore assume that the UE is located somewhere within the coverage area of the base station. The disadvantage of cell-ID is that it is too rough for the development of huge and large microcells Cmi cro-cei 1), and is not reliable for the development of small micro (micr0) and picocell (piC0-cell) elements. of. Another technique for simple positioning is the estimation of round-trip-time radio frequency distance based on the arrival time of the UE link (UL) transmission at the base station. An example of a UE positioning method used in a standardized 3G system is the arrival time difference of

Page 5 200404467 V. Description of the invention (2) arr i val, 0TD0A) method. As shown in Figure 1, a UE measures the arrival time of several downlink (DL) signals from the base stations of surrounding cells and reports the measurements (or the amount from these) to the network. Location in the network The entity then uses basic triangulation techniques based on the distances dO, dl, d2 to evaluate the location of the UE. For example, the UE measures the difference in arrival time between the serving base station 1 and the neighboring base station 102, and generates an elliptical band B11 relative to the possible ue. The UE then measures the difference in arrival time between base station 1 (Π and the neighboring base station 103) to generate another elliptical band B12 relative to the possible location of the UE. Now, the UE position must be at the intersection of zone bands B11 and B12. Each The zone has an intrinsic measurement error margin, em. For additional accuracy, another pair of OTDOA measurements on adjacent base stations can be used to fine-tune the evaluation of intersections. All accuracy and accuracy based on 〇TDOA The accuracy is improved due to the increase in available measurement data, especially when the UE can measure large & 2 or 3 surrounding base stations. However, the limitation of this method is that the serving base station has a transmission from the surrounding base stations. The blocking effect on the signal. Figure 2 shows how the performance of 0TD0A can be strengthened to resist the blocking effect. The base station 20 1 in service suspends its radio frequency transmission completely or partially intermittently in order to give every now in its cell— Opportunity for the UE to measure the DL parameters of the transmitting platform 202-207 in the surrounding cells. A general feature based on the 0TD0A method is that the position evaluation is based on triangulation technology, where In an amount of DL signals around the base station is performed at the UE ^ position accuracy and reliability in order to limit increases 0TD0A based positioning methods in the small cell size and multi-path environment. And

Page 6 200404467 V. Description of the invention (3)-Another group of UE positioning methods standardized for 3G systems is based on GPS technology using satellite-assisted positioning. In GPS, communication handsets receive data continuously transmitted from 24 NAVSTAR satellites. Each satellite transmits data indicating the satellite's own satellite position and when the message was transmitted. The cell phone compares the time a signal was received with the time it was transmitted to determine each satellite position. Using the position between the determined satellite and the mobile phone with each satellite, the mobile phone can triangulate to obtain its position and provide this information to the communication base station. However, the consolidation of GPS within the subscriber unit increases and its cost. 〃 Therefore, I hope to have another mobile user positioning method. Comprehensive description On a first user equipment (UE), at least one second bit (u p 1 i n k) signal is received and marked. Yu Xidi became a younger brother U L ·, and a downlink signal from at least one base station was received and marked with a. These times are then used to observe the difference in arrival time. The #s A ^% f time difference of the first UE is determined. Based on the arrival of this decision, the preferred embodiment illustrates that when the

In addition to the signal, UEs with known surrounding locations (including the received UL signal of the received DL are included in the position evaluation included in the mouth of the old 疋 # and mobile UEs). When considering T 怙, rely on triangulation

200404467

The performance of the localization method can be greatly improved. This is possible in any of the wheeler wireless communication systems capable of receiving or monitoring and measuring the bites of other UEs. The advantage of using a UL signal from a nearby UE is that the 叽 signal is stronger than the DL signal and the UL signal is not blocked like the surrounding base station DL signal. The advantage of using EI uplink transmission in the calculation of the location of a mobile user is that a mobile UE is more likely to receive transmission signals from other mobile UEs than a UE is more likely to receive transmissions from multiple base stations. In addition, it is possible to avoid the need for intermittent suspension of DL transmission at the base station of the mobile user. This principle can be applied to any RF access system, such as

Terrestrial Radio Access (UTRA) TDD, CDMA, TDMA & & TD-SCDMA. Preferably, in order to easily distinguish the UL and 叽 signals, it is hoped that the 叽 and 虬 signals can be separated by frequency and / or time, although this separation is not necessary. Figure 3 shows the UE-assisted positioning method operating in the TDD system 300. example. The system 300 includes a base station 31, 313, a radio network controller (RNC) 315, and mobile UEs. RncS is known in the art as a controller of a cluster of base stations. The base stations 3n gUEs 301, 302 serve base stations, and base stations 312, 313 are neighboring base stations. Mobile UE 3001 can receive / monitor the UL RF signal of UE 302 and measure its arrival time and / or compared to a reference signal, such as from its base station 3 丨 1 and / or neighboring base stations 3 1 2, 3 1 3. The arrival time difference (0TD0A) of the reception observation of a DL reference signal channel. Preferably, in the TDD system, the UE 301 may perform measurement of the U L transmission of the neighboring U E to assist the UE, any time it is used for its own transmission when it is idle or not in a U L time slot. This system

200404467 V. Description of invention (5) The time slot for UL and DL is determined by the RF access network. Using time difference information, elliptical areas between base stations 311-313 and between UE30 2 and base stations 31 and 313 are determined. As shown in Figure 3, three elliptical regions are constructed. The two zone bands B31 and B33 between the base stations 311-313 and the zone band B32 between the base station 311 and the UE 30 2. In addition, the refusal ((10, (11, (12)) between the UE 301 and the base stations 31 and 31 3 can also be determined at the base stations 311-313. Use this > to say that the position of the nose mobile station can be calculated.

FIG. 4 shows a flowchart of a UE assisted positioning method. A mobile UE detects UL signals from at least one neighboring UE and marks the time of each neighboring UE, in step 401. The mobile UE also detects DL reference signals from its base station and possibly one of the other base stations and marks the time of each of these DL signals' step 402. The time difference between all marked [JL and DL signals is calculated by the mobile UE, step 403. The time difference is preferably transmitted to rnC via point b to mark the position calculation, step 4 04. In general, more location information is used for 'location calculations to improve the accuracy of the results produced. The source of the additional location information is the received signal power (RSCP) and the transmitted power (Txρ) from a nearby mobile. Uf 301 measures the RSCp of nearby mobile transmissions, such as UE 302, and sends a signal of this information to the RNC. The RNC determines the path loss (TxP-RSCP) between this movement and its neighbors. Using the calculated path loss, the distance between the moves can be determined. As shown in Figure 5, the distance information of the circular band B51 increases the available positions. In combination with other elliptical bands, such as B31, 632 and "3, a more accurate evaluation of this bit is calculated. In another embodiment, mobile UE 3 0 1 is equipped with smart antenna technology, allowing

Page 9 200404467 V. Description of the invention (6) Port f, measuring and reporting the angle of arrival of the received ^ UL signal of the neighboring mobile UE 300 compared with a reference position. This mobile uE can additionally measure and report the arrival angles of a serving base station and neighboring base stations DL and neighboring UE UL transfer vessels. Figure ^ 6 shows another embodiment of a wireless system 600 having a cluster of base stations 611-613. Each base station is equipped with a smart antenna. Each base station 611-613 measures and reports the angle of arrival al, a2, a3 from one of the UL transmissions of the mobile UE 60, to assist in determining the location of UE 601. Figure 7 shows a simplified mobile device assisted by positioning with user equipment.

711, point B 712 and RNC 713. Mobile UE711 has receiving from base

UL and DL receivers 714 for stations and neighboring UEs. A time difference calculating means 715 determines the reception time of the UL and DL signals and determines the time difference between the received times. A signal transmitting device 7 丨 6 sends a signal of time difference information to the point β 71 2. Point β uses the signal receiver 71 7 to receive the signal of the transmitted information and pass this information to RNC 713. One of the positioning devices in RNC 713 7 1 8 uses this time difference information as well as the location of the known base station and nearby υ β to calculate the position of the mobile UE. In addition, the RSCP decision device 719 and / or the arrival angle device 720 may be used by the mobile UE 711 and the arrival angle device 712 at the base station / point B to provide information of another embodiment.

Page 10 200404467 Brief description of the diagram The first diagram shows a system using the 0TD0A-based mobile positioning method. The second figure shows a system that uses TDOA-based mobile positioning method to strengthen the prevention of obstruction. The third figure shows a system using a UE assisted positioning method. The fourth figure shows the flow chart of the UE-related 0TD0A-based mobile positioning method. The fifth figure shows a UE assisted positioning method using a path loss between UEs. The sixth figure shows a system using a network controller and a base station with a smart antenna. The seventh figure shows a schematic diagram of a mobile UE, a point B and a radio frequency network controller using a UE assisted positioning method. Component symbol description

101 UE measurement service base station 102 Oval band near the base station B11 UE location 103 Oval band near the base station B12 location 201 Base station in service 20 2-207 Transmission base station 300 TDD system 301 Mobile UE 302 service base station 311 -313 Base station 315 Radio network controller (RNC) B31, B33 zone band 611-613 Base station 600 Wireless system 601 Mobile UE Page 11 200404467 The diagram briefly illustrates the angle of arrival of al, a2, a3

ΙΗΙΙϋ Page 12

Claims (1)

200404467 6. Scope of Patent Application 1. A method for determining the position of a mobile user equipment (UE) in a wireless communication system, the system has uplink and downlink between UEs and at least one base station Transmission, the method includes: · receiving and time-stamping uplink signals of at least one second UE at a first mobile UE; receiving and time-stamping downlink signals from the at least one base station at the first mobile UE; using The time stamps determine the observed arrival time difference; and calculate the location of the first UE based on the determined arrival time difference. For example, the method of claim 1 in which the first UE is configured with smart antenna technology and determines the angle of arrival of the downlink signal, and uses the determined angle of arrival in the position calculation of the first UE. 3. The method according to item 1 of the patent application range, wherein the downlink signal is transmitted by a base station as a beacon channel. 4. If the method of claim 1 is applied, the method further includes determining a arrival angle of one of the first UE transmissions and using the determined arrival angle in the location determination of the first UE. 5. The method of claim 1, wherein the at least one second U E is a mobile U E with a known position. 6. The method according to item 1 of the patent application scope, further comprising: measuring, at the first UE, the number power received by one of the at least one second UE; using the measured number power received and the at least one second UE A transmission power level to calculate a path loss; and Page 13 200404467 The path loss determines a distance between the at least one second UE and the first and the UE using the calculation; Yu Di: The determined distance is used in the calculation of the UE position. 7._A ",", "and line mobile user equipment (UE), including: a receiver and a receiver for receiving uplink and downlink signals; A time difference between the received uplink and downlink signals; and the flood signal device is used to send a signal of the determined time difference 8. A radio frequency network controller (RNC) comprising: a niche display for receiving an observed difference in arrival time between a second user equipment (UE) and a base station when measuring at a first UE One of (0TD0A) is private, and the positioning device determines the position of the first UE using the 0TD0A between the second-and the base station, and the known position of the base station and the second one. 9. For example, the RNC of the patent application No. 8 wherein the positioning device is further used to receive an instruction from one of the two base stations 0TDOA and use the two base stations 0TD0A in the position determination. 10. In case of applying for the RNC of item 8 of the patent scope, the positioning device is further configured to receive an instruction between a third UE and the base station and use the third UE in the location decision. And the base station 〇TD〇A. 11. If RNC asks for the RNC of the eighth patent scope, the positioning device is further used to receive a Xunda angle from the first UE received from the base station-finger and use the arrival in the location decision angle. degree. - 200404467 6. Application for Patent Scope 12. If the RNC of the patent application No. 8 is applied, the positioning device is further used to receive an indication of an arrival angle of a signal received from the first UE from the base station, and This angle of arrival is used in this position determination. 13. If the RNC of the eighth patent application is applied, the positioning device is further configured to receive an indication of an angle of arrival of a signal received from the first UE from the second UE and use it in the position determination. The angle of arrival. Page 15